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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce85790ffca07413577648e1dde90e3ebfea5700c116e2739f855397f13eae3' 
  AND token = 'vxsE+v7A82s+bmXjQgqT8Xh84kAn3fEADbeE161YUTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}